废话不多说了,具体代码如下所示:
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<%@ page language= "java" contentType= "text/html; charset=UTF-8"
pageEncoding= "UTF-8" %>
<%@ page import = "java.util.*" %>
<%@ page import = "java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type" content= "text/html; charset=UTF-8" >
<title>表单提交</title>
</head>
<body>
<p align= "center" ><b>表单提交</b><br></p>
<center>
<div align= "left" >
<table height= "60" border= "0" align= "left" >
<tr>
<td>
<form name= "channelform" action= "addChannel.jsp"
onsubmit= "return validate_channel_info(this);" method= "post" >
名字:
<input type= "text" name= "channelname" />
<br />
ID:
<input type= "text" name= "channelid" />
<br />
<input type= "submit" value= "提交" >
</form>
</td>
</tr>
</table>
<script type= "text/javascript" >
function validate_channel_info(channelform)
{
if (channelform.channelname.value== "" )
{
alert( "请输入正确的名字" );
return false ;
}
else if (!isNumber(channelform.channelid.value))
{
alert( "请输入合法ID" );
return false ;
}
return true ;
}
function isNumber(str) // 判断是否为非负整数
{
var rx = /^[ 0 - 9 ]+$/;
return rx.test(str);
}
</script>
</div>
</center>
</body>
</html>
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以上所述是小编给大家介绍的Java后台开发之表单提交之前验证,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://blog.csdn.net/dreams_deng/article/details/54863388